Apparatus for manufacturing carbon paper



May 27, 1930. H. w. A. DIXON 1,760,045

- APPARATUS FOR MANUFACTURING CARBON PAPER Filed April 23, 1926 i "W; W "$1M "W H "I I i 2319.5. z y INVEE TR BY ATIOBZEYSf" Patented May 27, i 1930 UNITED STATES PATENT OFFICE narrow w. A. DIXON, or HOLLIS, New yorix, assrcmon T COLUMBIA manor: & CAR- non MANUFACTURING COMPANY, me, or GLEN COVE, NEW YORK, A CORPORATION OF NEW YORK APPARATUS FOR MANUFACTURING CARBON PAPER Application filed April 28,

I My invention relates to the manufacture of carbon paper, and has for one of its objects an improvement in the process of mama, facture whereby improved results will be obtained, as I will set out hereinafter in de- 1 practiced, theink with which the paper is and pigment colors, ground together.

coated is a combination of various oils, waxes intimately mixed and These inks are melted, put into the machine and applied to the paper by passing the paper over a roller WlllCll is rotated in the ink tank. This applies a surplus coating to the paper, and it is customary next to pass the coated side or face of the paper over an equalizer. This equalizer commonly consists of a small rod about three sixteenths of an inch in diameter wound throughout its length with fine wire, the dif ference in-the size of the wire governing the depth of the coating left upon the paper..

The relatively thick or heavy coating first applied to the paper is never applied to the full width of the paper, but an uncoated strip is left at each side, and while the passing of the paper over the equalizer spreads the ink to the sides somewhat, yet care is taken to prevent the ink from reaching the paper edges. 7

'Under this practice it will be apparent that a coated paper strip is provided, an uncoated or uninked border being left at each edge of the paper. ,I have found, however, that the border line between the inked and uninked portions of the paper has a very strong tendency to be thicker than the rest of the coated surface. This Ibelieve isv due primarily to two factors: First, the surplus ink held back by the equalizer tends to flow towards the sides of the paper, carrying with it the larger particles of pigment WhlCh are nearly alwa s present in the ink, thereby thickening t e border line second,the web of paper is stretched under tension and at an angle over the equalizer, with the result that the tension on the web is slightly less at the paper edges with a consequent slightly less 1926. Serial No. 104,087.

pressure against the equalizer which of course allows a slightly thicker coating close to the edge than elsewhere.

After the paper has been coated, and the ink chilled, it is wound upon a receiving roll under tension. It is here that the effect of the thickened edges is felt, this additional thickness multiplying as the paper is rolled up until the tension on the paper at the edges becomes so great as often to cause the paper to split. There isalso a stron tendency for the paper to run off the win -up roller instead of winding up straight and true.

A further disadvantage is that after the paper is sheeted it is somewhat more difiicult to stack many reams one upon' another, and it also becomes moredifiicult to out many reams in the guillotine cutter usually employed.

A further disadvantage in the practice above outlined is that the full width of the paper cannot be utilized.

By the present invention I am able to overcome, all the disadvantages above referred to, means having been provided whereby the thickened edge or head at the edge of the inked or coated surface is eliminated and the ink spread to the edge of the web instead, making it possible to utilizer the full width of the paper, and facilitating the rolling up of the coated paper upon the wind-up roller without the risk of splitting the paper.

In the accompanying drawings 1 have illustrated an embodiment of my invention,

Fig. 1 showing more or less diagrammatically a portion of a carbon paper making machine with my improvement applied thereto;

Fig. 2 being an enlarged view of part of the apparatus of Fig. 1; and

Fig. 3 being a view similar to Fig. 2 but and as the inked surface of the paper passesover it the surplus ink is removed. The machine as described so far is the usual commercial machine.

After leaving the equalizer 4, the paper web passes under and in contact with a relatively large heated roller 5, passing from thence over a chilling roller and the necessary guide rollers until it reaches the wind-up ary, and at the up-going side this roller,

viz., the right hand side as viewed in Fig. 1, I provide a shaft 6 1 ing parallel with the roller, and supporter? in suitable bearings one of which is partially shown at 7. This shaft carries a driving ulley 8 adapted to be driven from any suita 1e source of 'power. T is drive shaft rotates in a clockwise direction asviewedin Fig. 2, that is to say, in a direction opposite to the direction of rotation of the roller 5.

In front of the drive shaft 6 as viewed in Fig. 3, I provide a stationary rod 9 supported in suitable bearings 10 and 11 at each side of the machine. a p 1 Mounted on the driveshaft 6 adjacent each 'end thereof-is a: bevel gear'12 keyed to the shaft so as'to rotate therewith and slidable longitudinally thereof.

Ad'acent each end of the rod 9 is a bracket 13, a justable about the rod and held in ad'- justed position by a set screw 14 or any other convenient means. These brackets support and provide bearings for thevertically extending shafts 15 of edge wi er rollers 16, the lower end of each of the s afts 15 being providedwith a bevel gear 17 in constant mesh with the driving gears 12. The rollers IGIar-ei faced with felt or other suitable ma- .terial and rotate about a vertical axis as distingziished'from the rotation about a hori- Z'onta'l axis of the large roller 5. The driving arrangement just described causes the rollers 16 to rotate in opposite directions, and in a direction tending to. spread the ink" on the paper web towards each edge'of the web.

In operation the paper web 2 passes about the underside of theroller 5 and upwardly between the faceof this roller andthe edge wiper rollers 16, and due to the direction of rotation of these rollers the head or edge ofink which would ordinarily form on the I paper web is spread by these rollers over the otherwise uncoated margin, so that the entire face of the paper web is coated or inked, and

the thickened heador edgeof ink eliminated. Consequently not only is the entire face of the I vention.

true and straight upon the wind-up roller at the delivery end of the machine.

I also eliminate the dangerous stresses placed upon the edges of the paper due to the thickened heads formed on the paper in the usual carbon paper making machines as above explained. The adjustability of the wiper rollers 16 lengthwise of the roller 5 permits of a proper setting of the rollers with respect to webs of different widths, while the adjustability of v the rollers about the rod 9 enables the thinness of the ink coating at the edge of the web to be regulated to a nicety.

It will be seen from the foregoing, therefore, that I have provided a new process of making carbon paper as well ascertain im provements' in machines for manufacturing the paper. In the latter respect it is to be understood that changes may be made in the details of construction and arrangement of parts illustrated within the purview of my in- What I claim is: Y

t 1. In a machine for manufacturing carbon paper, the combination of an inking roller and an equalizer for applying a partial coating of ink to one face of a paper web, a roller rotatable about a horizontal axis about which the partially coated web is passed with its coated side outermost, and rollers rotatable about vertical axes and engageable .with the edges of the inked portion of the paper web and driven in a direction to s read or extend the ink outwardly toward the edgesof the web to the uncoated portion of the face of the web.

2. In a machine for the manufacture of I shaft lying parallel to said roller, a rod paralcarbon paper, a rotatable roller,: '9. drive lel to said drive shaft, brackets adjustably mounted on said rod, and rollers carried by said brackets cooperable with the; first mentioned roller and positively driven from said drive shaft. 7

3. In a machine for the manufacture of carbon paper, the combination of a drive shaft, bevel gears rotatable with said shaft and-adjustable lengthwise thereof, a pair of brackets, a-sup ort for each ofsaid brackets,

said brackets eing adjustable in said 'supports, a vertically extending shaft carried in each bracket, a roller carried by each of the last mentioned shafts, and a bevel gear on the opposite end of each of said shafts and in constant mesh with the first mentioned bevel' gears.

.This specification signed this19 day of April, 1926.

' HAROLD W. A. DIXON.

paper web coated or inked thereby permitti 11g the entire width of the paperto be used, but 

